This American Life: "Recently we heard about this test that could determine if someone was a psychopath. So, naturally, our staff decided to take it. This week we hear the results. Plus Jon Ronson asks the question: is this man a psychopath?"
Link to transcript, though I strongly recommend listening over reading when it comes to This American Life: http://www.thisamericanlife.org/radio-archives/episode/436/transcript
(Note: Even though This American Life has only recently heard about the test, the PCL-R has actually been around a good long while. See the author's site for cautions, etc: http://www.hare.org/scales/pclr.html)
Via Seth Capo